Similar and Dissimilar Friction Stir Welding of an AA2024/7050 Butt and T-Joint for Aeronautical Applications

Título da Tese: 
Similar and Dissimilar Friction Stir Welding of an AA2024/7050 Butt and T-Joint for Aeronautical Applications
Autor: 
Breno Boretti Galizoni
Área de Concentração: 
Engenharia Aeronáutica
Turma: 
PEE17
Ano da Defesa: 
2013
Data de Defesa: 
10/05/2013
Orientador Principal: 
Carlos de Moura Neto
Resumo: 

The design of metallic structures in the aerospace industry has changed to be possible the competition of aluminum alloys with the promising use of composite materials in lighter and cost-effective new generation of airplanes.  Friction Stir Welding (FSW) is one alternative to substitute the riveted assembly of parts during the aircraft production, reducing weigh, assembling time and costs. Objective of large interest by aeronautical companies, the development of the process understanding and the mechanical properties of the material welded are strategic for the FSW application in aircrafts structures. This research aims to obtain the best parameters of butt and T-Joints welds of high strength aluminum alloys, AA2024 and AA7050. Welding speed, rotational speed, force and tools were studied to obtain the best weld in terms of mechanical properties and compare with the base material. Best results presented ultimate tensile stress is around 97% of the base material, fracturing in the heating affected zone, consolidating a good weld. For T-Joints, the mechanical properties of the weld were not good. Changes in the clamping system and in the FSW tools, pin and shoulder, should be done to improve the quality of the T-Joints.